/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.optimizer.partition.pruning;

/**
 * @author chenghui.lch
 */
public enum PartFieldAccessType {

    /**
     * Access partition field by loading meta from metadb
     */
    META_LOADING("META_INIT"),
    
    /**
     * Access partition field by exec ddl and insert meta into metadb
     */
    DDL_EXECUTION("DDL"),

    /**
     * Access partition field by query predicates（include select/delete/update）
     */
    QUERY_PRUNING("DQL"),

    /**
     * Access partition field by insert values
     */
    DML_PRUNING("DML");

    protected String sqlDesc;

    PartFieldAccessType(String sqlDesc) {
        this.sqlDesc = sqlDesc;
    }

    public String getSqlTypeDesc() {
        return sqlDesc;
    }

}
